Chamberlain SL 1000-B3 Owner's Manual page 10

There are 2 different ways to close the gate (entering or exiting):
1. Reclose Timer: When the Reclose Timer expires, gate closes automatically (Master or Slave).
2. Interrupt Loop: clearing the Inside Interrupt Loops cause the gates to close (Master or Slave).
NOTE: To ensure gate closure, set Reclose Timer = ON in both Master and Slave units.
INPUT CONNECTIONS: Refer to Part 2 Master/Slave Layout and Wiring, for more details
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Master and Slave units require their own separate inputs.
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If Radio inputs are used in both units, each requires its own transmitter and entry code.
Rev E Doc 01-20201 7 of 33